<script type="text/javascript">
        var UM_Editor_MD5 = new Array();
        $(document).ready(function() {
            if(typeof UM != 'undefined'){
                if(UM.Editor.length > 0){
                    if(typeof um_message == 'undefined')
                        um_message = UM.getEditor('message');
                    if(!!um_message){
                        var firstContent = um_message.getContent();
                        var fcMD5 = $.md5(firstContent);
                        UM_Editor_MD5[um_message.id] = fcMD5;
                    }
                }
            }
        });
</script>